45. what is thought to be true about the three domains of living things?
a.
they diverged from a common ancestor fairly recently.
b.
they diverged from a common ancestor before the evolution of the main groups of eukaryotes.
c.
they did not have a common ancestor.
d.
domains bacteria and archaea evolved after the main groups of eukaryotes.

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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